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Investments and Derivative Instruments - Narrative (Details) (USD $) | Dec. 01, 2012 | Mar. 31, 2013 Preferred Stock | Jun. 30, 2012 Preferred Stock
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Schedule of Trading Securities and Other Trading Assets |  |  |
Notional amount of interest rate derivatives | $ 10,000,000 |  |
Fixed future interest rate effective due to swap | 0.48% |  |
Fair value of trading securities in unrealized gain position |  | 18,200,000 | 16,500,000
Fair value of trading securities in unrealized loss position |  | $ 2,563,000 | $ 2,891,000

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